FAO New Judge

[4GS]

In a condenser operation engine lubricating oil has been known to foul condensing equipment, therefore any steam locomotive would need to use a well-counterbalanced expander that could operate at extremely short inlet valve cut-off ratios, perhaps even under 5% to enhance efficiency.

Hope this helps

[Doc Spock]

Well it certainly helped me.

[leg_end758]

Certainly made my morning jon.

Im just offf to polish my steam engine forthwith.



T D H : )

[4GS]

Also, exhaust steam from the expander would flow into an expansion chamber ( a diffuser section where diameter increases along its length). Steam velocity would decrease in the diffuser as its pressure is marginally increased. The diffuser would connect into several parallel pipes that recombine into an adjustable water-cooled choke valve, the settings of which would be determined by the upstream steam line choke valve settings and the engine inlet valve setting. The water pipes and choke valve(s) would be submerged in high-pressure feedwater.

A vacuum fan operating downstream of the water-cooled valve would increase the pressure difference across the valve. The increased pressure differential would allow more heat to be removed from the cooled exhaust steam passing through the valve at sonic speed. A higher proportion of the steam would be changed into high-temperature liquid water that would be further cooled in the parallel-flow/counter-flow radiators

[hau kola]

Whooooooooosh

[4GS]

It's also important to remember that the diffuser, parallel pipes and choke valve all would be housed inside the feedwater heater and submerged in feed water. A large proportion of the latent heat of vapourization of the low-pressure exhaust steam could be transferred into the high-pressure feedwater coming from the locomotive radiator, in which hot water (exhaust would be cooled). Exhaust steam at 60-psia @ 293-deg F could transfer some 900-BTU/lb to the cooler (150-degrees F), high pressure feedwater. The multiple radiators would be able to transfer over 263-BTU/lb of exhaust heat to the atmosphere, on a locomotive that could develop up to 2,000-Hp.

A heat pump may be used to assist in transferring heat from the expander exhaust into the feedwater. Water at 1,000-psia @ 150-deg F would be able to absorb a high proportion of the reject engine heat. The heated feedwater would be heated by energy from the PCM system prior to it being added to the accumulator, which would provide the locomotive with the reserve capacity needed to perform arduous tasks. A condenser and feedwater heater installed in a PCM fireless steam locomotive could extend its operating range depending on the amount of energy contained in the PCM storage system.

Hope that all helped

[bigmamma]

Ah , now I can get on with it .....

[unrulyjulie]

john, would you be deeply offended if i made an admission to NOT having just wasted 2 mins of my life reading through that!?

sorry :-(

jules sniggering at how fast leggie is polishing his engine :-)

[Doc Spock]

have you seen the massive pistons on the giants of the CPR

the punishing forces of thousands of horses, well you know what pistons are.

or you think you do but you've yet to see the awe inspiring trick

of the work that's done on a non stop run by a man like dead eyed dick.

Eskimo Nell ( circa 1923)

[China Doll]

My, but this is boring William.... ;0P

[Pong]

Is this supposed to be funny ?

If so, can somebody explain why.

[pips1]

I think it is tongue in cheek - sarcasm - bet New Judge wishes he had never mentioned liking steam engines! He won't be reading this tho' as he said he was going for good - we'll see!

[unrulyjulie]

pong, go to my "question" New Judge thinks we should stop all the chitter chatter and talk about something incredibly more interesting, his suggestion being.............steam engines!

[Pong]

Why though take the rise out of somebody for liking steam trains ? Seems extremely juvenile.

I wonder has the poster ever seen a Britannia 4-6-2 at full chat ?

[China Doll]

Oh is that what this is all about?!

And here's me thinking it was an informative yet boring thread. (Not unlike some of the chitter chatter actually).

Coffee?

[Pong]

I've just asked the Ed for a special section devoted to steam trains, cos I happen to like them as well.

[4GS]

One sugar please China

[unrulyjulie]

pong, i would imagine that would go under the topic of hobbies and interests.

[China Doll]

It'll never happen Pong, I'm still waiting for Cheese and Shoe sections but alas...

I think Jules or kola said they were making the coffee. And bacon rolls for everyone too. At least that was my understanding.

[Pong]

Good, there's the OP - I say 4GS, have you ever seen a Britannia 4-6-2 at speed ? They used to work the Norwich line.

[4GS]

Cheese and Shoes China?
Strange combination, I prefer biscuits or a slightly salted cracker with my cheese, still each to their own.

Where's that darn coffee?